Source: Bridget Bowman, ROLL CALL, 9/6/18


Democrats continue to dominate the latest list of the most vulnerable Senate incumbents two months out from Election Day, with North Dakota Sen. Heidi Heitkamp moving into the top spot. Heitkamp displaces Nevada Sen. Dean Heller, who nevertheless remains the most vulnerable incumbent on the Republican side and the only GOP senator running in a state Hillary Clinton won in 2016.

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